Pipe form



Y G. ALMQulsT 1,837,092

PIPE FORM Filed April 5, 1930 v2 Sheets-Sheet l fly'. l.

PIRE FORM 'Filed April 541950 2 sheets-sheet 2 INVENTOR ATTORNEY Patented Dec. 15, 1931 UNITED STATE-S GUsALimUIsT, or'rnnms, cALIroIszuiL` PIPE roma:

This invention relates -to `concrete formsfor use in connection 'with' a stripping machine, and the" invention has as neofgits objects to provide'a form whichwill be exl .5 ceptionally substantial'and 'not liable to be-y come dented or'- distorted. 1

Pipe forms of this class areordinarily made expansible and contractible, so `that after the form hasbeen closed and the pipe has been molded and set, the lform may be expanded so as to'` permit of its withdrawal from the molded pipe section, and it is therefore desirable, in order to prevent bending or distortion of the form, that the same be l5 made of heavy cast steeland consequently it is desirable that the means for expanding and contracting the form be equally substan-l tial and positive in its action and yetcapablev of operation without expenditure of the force ordinarily required in .closing'fsuch forms,

wherethe formsare made of thin sheet metal,

in which instance they present the disadvantage above set forth. Therefore, the" present invention has as another'object to rovide a novel means whereby the form may e drawn closed and likewise 'released so aste permit of its expansion, in such a manner as to in# sure against damaging the molded pipe.

Another object of the invention is to provide a form whichV will be substantially air tight when it is closed, for the molding of the pipe so that the concrete willhold its form until it is set. In the old types ofv forms 'for molding concrete pipe,a stationary ring has been emplo ed in the upper end of the mold form, and this ring is lifted off'when the pipe has' been molded and the pipe then stripped without any protectionbeing offered tothe end of the pipe,`with the result that a great 40 number of the molded pipes are spoiled or damaged in the stripping operation, and

therefore the present invention has as a further objectto provide, in a mold form of this class, a ring, so mounted, in the kmold form that it will remainiin placeupon the upper end of the molded pipe when the form is stripped from the pipe, thus protecting this edge and preventing the deformation of this portion o the pipe. "I f "1 'y j This invention also consists in certain other features of construction and in the combina` tion and arrangement of the several parts to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claim. v

In describing my invention in detail,`reference will be'had to the accompanyingdraw-i ings wherein like characters denote likevor corresponding parts throughout Vthe several views, and inwhich 00 Figure 1 is a view illustrating the mold form embodying the invention. V

Figure` 2 is a horizontal sectional viewV through one side of the mold form illustrat` ing the mold form, and the" contracting and expanding means therefor in position toexpandthe form.

, -Figure 31s a similar view illustrating the expanding and contracting means in position to contract the form, the operating lever being shown inbreken lines. y y. Figure 4 is a detail sectional view through a 'part Vof the expanding andf contracting means. i y 1 Figure 5 is adetail sectional view Vthrough 75 the upper end of the body of the form, the top ring thereof being removed. i v

Figures 6, 7 and 8 are detail viewssimilar to Figure 2`illustrating` the relative arrangement of the upper, intermediate and lower eccentrics of the mold form.

The mold form 'embodying thei invention comprises a hollow cylindrical body 1 which is preferably of heavyV sheet steel` and this y body is divided vertically atone side, yas 'in- 85 dicatedby the-numeral Zand, at itsupper endthe body is interiorlybeveled asindicated bythe numeral 3 and a ring `l isftted in this end of the body and has an-outwardly y flared upper portion 5 whichseats against the 90 beveled surface 3, the ring-being interiorly beveled at its lower edge as indicated by the numeral 6. Another ring, indicated bythe numeral7 is designed to be fitted into the upper end of the `body within the circumference of the ring4 and this ring is of'substantially frusto-conicalffvorm and is. provided at its upper edge with an inwardly projecting relatively narrowilange 8 and'at its lower edge with an outwardly projecting relatively In order that the space formed: bythe vertical division of the body may be closed, a late 13 is welded to the outer side ofthe ody at one side of the division line or split 2 and has a portion 14 projecting beyond this edge lof the bodyandrdesigned to` overlap the op Osite edge of the body. u

f ,elded or otherwise suitably securedv to the outer side of the body 1 at one side of the line of division are a series of bearings indicated: by the numeral 15, and each includinga pair of spaced apertured' ears 16, and a shaftV 17 ismounted in the apertures in the ears and eccentrics 1,8V are fitted upon and keyed to the shaft, as indicated by the numeralV 19, eachA between the ears of a respective one of the bearings 15.l The sha-ft is provided atits lower end with a head2() to engage beneath the lower ear of the lowermost one ofthe bearings 15, and a crank handle 21is secured to the upper end of the shaft preferably by a cross pin, and is located directly above the upper one of the ears ofthe uppermost one ofthe bearings 15. A ring 22 is fitted toeacheccentric 1,8.and is provi'ded'with an integral outstanding threaded socket 23 into which is threaded one end ofthe stem 24, and, provided, at' its opposite endv with a collar 25 Vseated in and pivotally mounted between` the sides of a recess. 26 formed in a member 27' which is welded to the plate 13, the pivot for the stemv comprising a pin 28 which is fitted through an openingl inthe collar 2 5,A and through the side walls of the said recess in the member 27.

In order to further insure ofia tight closure for thedivided side of the form, each bearing member '15`l is formedjat that side of its base which is presented toward the division of the wallgof the formwith a lip 29 which projectsfover thelexpanded edge portion 14 of the plate 13 so that this portion of the plate isremforced againstV any outward spreading. Inorder that the eccentrics may be proporly, assembled withthe shaft 17, each eccentrie is formed 'inone side ,of the opening therein with, a groove 30 and the keys 19' for connecting the eccentrics for rotation with the shaft 17 are seated in narrow -recesses 32 for-merlin one side of the shaft, andin assembling the-parts, `the sockets 23 of the eccentrics are threadedontothe stems-24A to the proper point of, adjustment, y and the rings are then disposedzbetween the earsil of. the respective @Brings 1 5, Yandthe' shaft 17 is theny fitted upwardly through the openings in the ears 16 and in the eccentrics 18 until the key recesses 32 are relatively close to the lower ear of each respective bearing, whereupon the keys are fitted into the recesses and the shaft is further shifted upwardly toA effect engagement of the keysA in thegrooves 30, the said lower ear of each bearing being provided in one side of its wall with a groove 33 to permit of free passage of the projecting end of the respective Inlthe use/of the form, the ring 7 is fitted vdownwardly in the beveled upper end 5 of Y the ring 4and theI turning table of the molding machine, in connection with which the form is. used is rotated to` bringy the form under the packer head of the mold4 which is lowered. into the formthrough the rings 7 and 11 until yit reaches the bottom of the form and rests at; its lower end. upon the said table. In stripping the form, after the concrete has set, the ring 7 is left on top of the molded pipe, in the upwardy movement of the form, and inasmuch as the body of the form rests at its beveled. lower end 10. upon the beveled edge 12 of. the lower ring 1.1, this ring will likewise remain at the bottom,y or lower end ofthe pipe.

f Itwill beevident from the foregoing that by the mere actuationv of the lever 21, all of the eccentrics are simultaneously rotated so as toeither close the form or expand the same and `due tothe use of this type of connection between the portions of the form, body at the opposite sidesof'the line or division, the open.- ing and closing of the form may be` accomplishedI with little eiort.

Asshown in Figures 6, 7 and 8 of the drawings, thekeys. 19 which secure the eccentrics ofthe upper intermediate, and lower eccentries of the.4 contracting and1 expanding units, are so positioned with respect to the circumferenceofthe shaft 17, astomountthe eccentrics in such relatively different angular positions withregard to the eccentricsas to effect opening or: spreading of the open side of the form, initially, at the'bottom ofthe form and, finally at the top of the form,iso that the form is caused toassume a slightly tapered shape asit isexpanded and this permits of the entranceof air into the form, about the pipe, at the bottom of the form and thereby prevents the formation of a. partial vacuum which is liable to result whenv the form is opened or expanded uniformly throughout its length and as this causes the form tol somewhat adhere to the pipe, the pipe is liable to be split lengthwise, thereby resulting in: a great loss tothe manufacturer. For example, it willI be observed. by reference to Figure 6, which representsthe eccentric andkey, therefor, whichisupper most', inthe series,the key is displaced, inthe directionofthe formbody, a distanceof approximately-5o fromthe posi.- tOIl., of the key ofthe `intermediate ,eccentric shown in Figure 7, which keyis directly on a line coincident with the axis of the stem 24, and, in the instance of the eccentric and key shown in Figure 8, which is the lowermost one of the series, therke is displaced in a direction away from the ody of theform a distance equivalent to 5 and, due to this rela,- tively initial positioning of the eccentrcs, expansion of the form, in themanner stated above, is effected and therefore the form may be Withdrawn from the moldedpipe Without any likelihood of damage to the said Vpipe or any likelihood of splitting of the same.4

What I claim is a t In a pipe mold form a hollow cylindrical 5 body divided longitudinall at one side, a

shaft mounted at one side o the line 'of division of the body, eccentrics fixed for rotation with the shaft, means for manually rotating the shaft, a ring surrounding each eccentric, and a stem extending from each ring and piv otally connected with the body at the other side of the line of division, the eccentrics being arranged in a vertical series and the major axes of the eccentrics intersecting the axis of the shaft, throughout the series, the major axis of the intermediate eccentric and the axis of the shaft lying in a plane which bisects the angle between the corresponding planes of the end eccentrics.

In testimony whereof I aix my signature.

GUS ALMQUIST. 

